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Texas Instruments LM2675MX-3.3/NOPB
- Part No.:
- LM2675MX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2675MX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,993
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Product details
Overview
LM2675MX-3.3/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering 3.3 V at up to 1 A output current, operating from 8 V to 40 V input, with ±1.5% output voltage tolerance and 260 kHz fixed-frequency operation. It integrates a DMOS power MOSFET switch, internal frequency compensation, and thermal/current protection-designed for compact, high-efficiency power conversion in industrial and embedded systems.
For engineers reviewing the LM2675MX-3.3/NOPB datasheet, LM2675MX-3.3/NOPB pinout, LM2675MX-3.3/NOPB application, or LM2675MX-3.3/NOPB equivalent, key selection criteria include its fixed 3.3 V output, SOIC-8 package compatibility, 96% peak efficiency, TTL-compatible enable control, and minimal external component count (5 total).
Technical Context
The LM2675MX-3.3/NOPB implements a synchronous-free buck topology using an integrated high-side DMOS FET switch and internal 260 kHz oscillator. Its feedback loop regulates output by comparing FB pin voltage against a precise 1.21 V internal reference-though for this fixed-output variant, FB is internally tied to output, eliminating external resistor dividers.
It features TTL-compatible ON/OFF control with 1.4 V threshold, thermal shutdown, cycle-by-cycle current limiting (1.25–2.1 A), and frequency foldback under short-circuit conditions. The SOIC-8 package uses a single exposed GND pad (DAP) for thermal management, requiring direct PCB ground connection per TI AN-1187 guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% over line/load/temperature - ensures stable logic rail supply without trimming. |
| Max Output Current | 1 A continuous - supports microcontroller cores, FPGAs, and peripheral ICs in mid-power applications. |
| Input Voltage Range | 8 V to 40 V - accommodates 12 V/24 V industrial buses and unregulated DC supplies. |
| Switching Frequency | 260 kHz (±10%) - enables use of small, low-cost 47–68 µH inductors and reduces EMI vs lower-frequency alternatives. |
| Efficiency | Up to 96% at 12 VIN/1 A - minimizes heat generation; copper PCB traces suffice as heatsink. |
| Quiescent Current | 3.6 mA active, 50 µA standby - enables low-power sleep modes in battery-backed or energy-conscious systems. |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, and frequency foldback - prevent damage during overload or short-circuit faults. |
Pinout & Package
LM2675MX-3.3/NOPB is packaged in an 8-pin SOIC (D package), 4.9 mm × 6.0 mm body with exposed thermal pad (DAP) connected to GND. The DAP must be soldered to a minimum 1-inch² PCB copper area for thermal performance per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CB | Bootstrap capacitor node | Connects 470 nF ceramic capacitor between CB and VSW to drive high-side FET gate; critical for proper switch conduction. |
| 2 NC | No-connect | Internally unused; leave unconnected and un-routed on PCB. |
| 3 NC | No-connect | Internally unused; leave unconnected and un-routed on PCB. |
| 4 FB | Feedback input | Internally tied to output for fixed 3.3 V version; no external divider required-simplifies layout and improves stability. |
| 5 ON/OFF | Enable control input | TTL-compatible; ≥1.4 V enables regulation, ≤0.8 V disables output with 50 µA standby current. |
| 6 GND | Power ground | Main return path for input/output capacitors and inductor; must connect directly to low-impedance system ground plane. |
| 7 VIN | Input supply | Accepts 8–40 V; requires low-ESR input capacitor placed <2 mm from VIN/GND pins to suppress switching noise. |
| 8 VSW | Switch node | Drives external inductor and catch diode cathode; high dv/dt node-requires tight loop routing and guard ring isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity. |
| Patented internal frequency compensation | Enables stable operation with only 5 external components-no loop compensation design expertise required. |
| Fixed 3.3 V output configuration | Removes FB resistor divider, improving accuracy, reducing part count, and avoiding feedback trace noise coupling. |
| TTL shutdown with ultra-low standby current | Supports system-level power sequencing and deep-sleep states with <100 µA total quiescent draw. |
| Robust fault protection | Combines thermal shutdown, current limiting, and frequency foldback to survive sustained overloads without latch-up. |
Applications
| Industrial PLC I/O Module Power | Embedded Controller Core Supply |
|---|---|
|
Use Scenario: Providing clean, regulated 3.3 V to digital I/O banks, ADC references, and communication interfaces in programmable logic controllers operating from 24 V DC rails. IC Role / Device Role / Timing Role: Primary buck converter supplying isolated 3.3 V domain; replaces linear regulators to avoid >2 W thermal dissipation at 1 A load. Use Value: Delivers 94% efficiency at 24 VIN/1 A, reducing board temperature rise by >15°C versus LDO-based solutions-enabling fanless enclosure designs. |
Use Scenario: Powering ARM Cortex-M4/M7 microcontrollers and associated peripherals (USB PHY, Ethernet MAC) in edge gateway devices. IC Role / Device Role / Timing Role: Main system regulator generating core voltage; enabled/disabled via MCU GPIO for dynamic power management. Use Value: 50 µA standby current and fast startup (<100 µs) support low-duty-cycle wake-on-event operation while maintaining real-time responsiveness. |
| Medical Sensor Signal Chain | Automotive Body Control Module |
|
Use Scenario: Supplying precision analog front-ends (AFE), low-noise op-amps, and SAR ADCs in portable diagnostic equipment powered by 12 V batteries. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 3.3 V source; operates in continuous conduction mode to minimize output ripple affecting signal integrity. Use Value: ±1.5% output tolerance and <10 mVPP ripple (with recommended 47 µF tantalum + 0.1 µF ceramic output cap) ensure <1 LSB error in 12-bit ADC conversions. |
Use Scenario: Generating 3.3 V for CAN transceivers, EEPROM, and microcontroller peripherals in 12 V automotive body electronics. IC Role / Device Role / Timing Role: Load-switched secondary regulator; withstands load dump (40 V transient) and cold-crank (6.5 V min) per ISO 7637-2. Use Value: 8–40 V input range and thermal shutdown allow reliable operation across automotive battery extremes without external supervision circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675M-3.3 | Same silicon, identical electrical specs, but offered in PDIP-8 package (9.81 mm × 9.43 mm) with no thermal pad. | Larger footprint and higher θJA (95°C/W vs 105°C/W) - suitable for prototyping or low-density boards where SOIC reflow is unavailable. | Select when through-hole assembly or legacy socket compatibility is required; verify thermal margin at full 1 A load. |
| TPS5430DDAR | 3 A output, 500 kHz switching, adjustable output; requires external feedback resistors and compensation network. | Higher current capability and flexibility-but adds 3–5 extra components and design validation effort. | Choose only if future scalability to >1 A or programmable output is needed; not drop-in compatible due to pinout and control differences. |
Compared with LM2675M-3.3 and TPS5430DDAR, the LM2675MX-3.3/NOPB offers optimal balance of simplicity (5-component design), thermal performance (SOIC-8 with DAP), and production readiness-making it ideal for cost-sensitive, volume-manufactured 3.3 V buck applications where fixed output suffices.
Availability
LM2675MX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, embedded controller power, and medical sensor supply applications requiring stable component supply, long-term lifecycle assurance, and TI-qualified manufacturing traceability.
Supply support for LM2675MX-3.3/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2675 series belongs to TI's SIMPLE SWITCHER® family-designed specifically for engineers seeking robust, easy-to-implement DC-DC solutions that minimize design time while meeting industrial and automotive environmental requirements.
FAQ
What is the maximum input voltage rating for LM2675MX-3.3/NOPB?
The absolute maximum input voltage for LM2675MX-3.3/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding internal device stress limits and may trigger overvoltage protection or permanent damage. For automotive cold-crank scenarios down to 6.5 V, the device remains functional but output regulation may degrade below 8 V input.
Does LM2675MX-3.3/NOPB require an external feedback resistor network?
No. The LM2675MX-3.3/NOPB is the fixed 3.3 V output variant-the feedback pin (FB) is internally connected to the output, eliminating the need for external resistors. This simplifies layout, improves regulation accuracy, and removes sensitivity to PCB trace noise on the FB node. External resistors are only required for the adjustable version (LM2675MX-ADJ).
How does the thermal pad (DAP) on LM2675MX-3.3/NOPB affect PCB layout?
The exposed thermal pad (DAP) on LM2675MX-3.3/NOPB must be soldered to a dedicated GND copper pour of at least 1 inch² on the PCB's primary layer. Thermal vias (≥4× 0.3 mm diameter) should connect the pad to inner-layer and backside ground planes. Failure to implement this reduces thermal resistance from 105°C/W to >150°C/W, risking thermal shutdown at full 1 A load.
Can LM2675MX-3.3/NOPB be used in discontinuous conduction mode (DCM)?
Yes. LM2675MX-3.3/NOPB automatically transitions into DCM at light loads (<200 mA typical), reducing switching losses and improving light-load efficiency. The device maintains regulation and fast transient response in both CCM and DCM. Figure 5-16 in the datasheet shows verified DCM waveforms with 300 mA load and 15 µH inductor.
What is the purpose of the CB pin on LM2675MX-3.3/NOPB, and what capacitor value is required?
The CB (bootstrap capacitor) pin on LM2675MX-3.3/NOPB supplies gate drive voltage for the internal high-side DMOS FET. A 470 nF X7R ceramic capacitor must be placed directly between CB and VSW pins-low-ESR and located within 2 mm of the IC. Using incorrect value or type causes erratic switching, reduced efficiency, or failure to start.
LM2675MX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2675MX-3.3/NOPB FAQ
1.How can I place an order for LM2675MX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675MX-3.3/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2675MX-3.3/NOPB reliable?
The price and inventory of LM2675MX-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2675MX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675MX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675MX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675MX-3.3/NOPB?
LM2675MX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675MX-3.3/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2675MX-3.3/NOPB?
For technical support, including LM2675MX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675MX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2675MX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675MX-3.3/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2675MX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675MX-3.3/NOPB?
All LM2675MX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675MX-3.3/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2675MX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2675MX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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